Hi guys, Potentially a strange one for you... I'm running a test on an EC2 instance with 64G available memory and jmeter's heap sized appropriately (currently Xmx40g) configured for 6K concurrent users and 200TPS. When the test reaches 4k users I get the following error message output:
WARNING: Could not lock User prefs. Unix error code 24. Nov 05, 2019 7:49:00 PM java.util.prefs.FileSystemPreferences syncWorld WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock. And in my jmeter.log a stream of these: 2019-11-05 19:47:44,512 ERROR o.a.j.c.CSVDataSet: java.io.IOException: Stream closed 2019-11-05 19:47:44,612 ERROR o.a.j.c.CSVDataSet: java.io.IOException: Stream closed 2019-11-05 19:47:44,612 ERROR o.a.j.c.CSVDataSet: java.io.IOException: Stream closed 2019-11-05 19:47:44,612 ERROR o.a.j.c.CSVDataSet: java.io.IOException: Stream closed Test errors are out of control from this point onwards (60 - 70%) despite application health looking good - I'm assuming because jmeter is unable to send CSV parameterised requests? I did a little digging and it seems to be a Java install specific issue? Although I find it strange that I get these errors at 4K threads every time. I am running jmeter as root and my Java system preferences file is writable for all: lrwxrwxrwx 1 root root 35 Nov 5 18:15 .systemPrefs -> /usr/java/latest/.java/.systemPrefs java -version java version "1.8.0_231" Java(TM) SE Runtime Environment (build 1.8.0_231-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode) echo $JAVA_HOME /usr/java/jre1.8.0_231-amd64 Any help or info from someone who has experienced this before greatly appreciated. Kind Regards, Kieran Kieran Lynch Portaltech Reply Nova South 160 Victoria Street, Westminster London SW1E 5LB - UK phone: +44 (0)20 7730 6000 k.ly...@reply.com<mailto:k.ly...@reply.com> www.reply.com [Portaltech Reply]
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